Ajax :: Perform A Request As Someone Is Typing Into A Text Field?

I need to perform an Ajax request as someone is typing into a text field. But I don't want to trigger a request on every key press. What I need is to perform the request if a key has not be pressed for x number of milliseconds.I seen an answer here - Time Restraint - but I'm having difficulty applying it to my situation.I'm using jquery and this is a trimmed down version of my current code:

javascript Code:
Original
- javascript Code

I don't know how to change this function to use setTimeout in a way that lets me execute a trigger function on a control relative to the current field. Ideally I need to pass $(this) as a parameter for the function setTimeout calls, but I don't know how to do that when the function call is passed as a string.